Multiple window sash construction



7 Sheets-Sheet 1 INVENTOR. ALEERT 6. LARSON :m m mi Ea m July 29, 1941. A. G. LARSON MULTIPLE WINDOW SASH CONSTRUCTION Filed Apri1 24. 1935 I ii:- I fill!!!r/IIIIIIlI/lf/Illr A. G. LARSON MULTIPLE WINDOW SASH CONSTRUCTION July 29, 1941 Filed April 24, 1955 '7 Sheets-Sheet 2 INVENTOR. ALBER 6. LARSON July 29, 1941 A. G, LARSON.

MULTIPLE WINDOW SASH CONSTRUCTION Filed April 24, lss '7 Sheets-Sheet s INVENTOR. ALBERT G. LA'R5ON y 1941- A. G. LARSON MULTIPLE WINDOW SASH CONSTRUCTION Filed April 24, 1935 7 Sheets-Sheet 4 IIIIIHH ",IIIIIIII HIIU INVENTOR. A L 5 5/27 6. LARSON July 29, 1941. A, LARSON 2,251,251

MULTIPLE WINDOW SASH CONSTRUCTION Filed April 24, 1935 7 Sheets-Sheet 5 Will/MIM IN V EN TOR.

A LBERT G7 LARSON.

July 29} 1941. A. G. LARSQN 2,251,251

MULTIPLE WINDOW SASH CONSTRUCTION Filed April 24, 1955 7 Sheets-Sheet 6 July 29, 1941. A. G. LARSON MULTIPLE WINDOW SASH CONSTRUCTION Filed April 24, 1935 7 sheets sheet 7 3 G 0 e 6 4 r ALEERT I a WP a 2 M E 5 o 0 \N m vww E. w a p 5 Ln" y m n x a M E L 6 2? i .P 56 f s M Patented July 29, 1941 UNITED STATES PATENT OFFICE 2,251,251 MULTIPLE WINDOW SASH CONSTRUCTION aid, Edmund B. MacD Mosely onald, and Tomlinson 1.

Application April 24, 1935, Serial No. 17,946

14 Claims.

This invention relates particularly to a window frame having a plurality of sashes slidably pivoted therein, whereby all of said sashes may be opened and closed simultaneously, or one of the sashes may be disconnected from the remaining sashes to operate independently thereof.

An object of the invention is to provide an operating mechanism fora plurality of sashes in p a window frame, whereby one of the sashes will open and close all of the sashes simultaneously, or said one sash may be opened and closed independently of the other sashes, after said other sashes have been placed in the opened position.

A further object of the invention is-to provide an operating mechanism for a plurality of sashes which is adaptable to window frames of either the wood or metal type, which will be s'uperionin point of simplicity, inexpensiveness of construction, positiveness of operation, and facility and convenience in use and general efliciency.

In this'specification and the annexed drawings, the invention is illustrated in the form considered to be the best, but it is to be understood that the invention is not limited to such form, because it may be embodied in other forms; and it is also to be understood that in and by the claims following the description, it is desired to cover the invention in whatsoever form it may be embodied.

In the accompanying drawings:

Fig. 1 represents a vertical section through a sash operating mechanism constructed in accordance with my invention.

Fig. 2 is a side elevation of Fig. 1 showing the sash operating mechanism in the closed position.

Fig. 3 is a section similar to Fig. 1 and showing the sash operating mechanism for maintaining the sashes in the open position.

Fig. 4 is a front elevation of Fig. 3.

Fig. 5 is a section similar to Figs. 1 and 3, illustrating the mechanism with upper sashes maintained in the opened position and the lower sash in the closed position.

Fig. 6 is a perspective view of a window frame having a plurality of sashes therein, together with operating mechanism for said sashes, said oper ating mechanism in Fig. 6, corresponding to the position shown in Fig. 5.

Fig. 7 is a vertical section through the sash operating mechanism similar to that shown in Fig. 5 and illustrating the slide of the lower sash in position to manipulate the said mechanism to bring about a closing movement of all the sashes.

Fig. 8 is an enlarged section taken through Fig.7 on the line 88.

Fig. 9 is-a perspective view of a steel window frame having a plurality of sashes arranged therein and mounted on a sash operating mechanism constructed in accordance with my invention.

Fig. 10 is a vertical section through the window frame and sash, taken on the line Ill-Ill of Fig. 9.

Fig. 11 is an enlarged detail illustrating the connection between the sash and the operating mechanism on the frame, and showing the parts in the normal or closed position.

Fig. 12 is a perspective view similar to Fig. 11 but showing the sash in the partly open position.

Fig. 13 is a cross section taken through Fig. 11 on the line l3-l3.

Fig. 14 is a perspective view of a section of one of a plurality of sashes, which said sash is detachably connected to a bar for operating a plurality of. sashes.

Fig. 15 is a side elevation of the sash shown in Fig. 14 but showing the same in partially opened position, and illustrating the operative movement of the mechanism connected therewith for manipulating the other and remaining sashes.

Fig. 16 is a section taken through Fig. 14 on the line l6-i6.

Fig. 17 is a perspective view of a conventional type of wooden window frame having a plurality of wood sashes therein, and a sash operating mechanism interposed between said sashes and the frame in accordance with my invention.

Fig. 18 is an enlarged perspective view of the operating mechanism for interconnecting two sashes, and showing the mechanism for the lower sash in the closed position, and the mechanism for the upper sash in the open position.

Fig. 19 is a perspective view of the sash operating mechanism shown in Fig, 18, but showing both the upper and lower sashes in the partially open position.

Fig. 20 is a cross section through a window frame and sash, and the sash operating mechanism therein, taken on the approximate line 20-40 of ,Fig. 1'7.

Fig. 21'is a diagrammatic view showing in particular the operating mechanism of one sash in relation to the operating mechanism of one or more other sashes, and showing the same in the closed and inoperative position.

Fig. 22 is a diagrammatic view which shows the position of the lower operating sash after it has engaged the mechanism of the other sashes to bring the same into the open position.

Fig. 23 shows the next step in the operation,

' inwardly as at I5.

wherein the lower sash mechanism has been returned to the normal closed position and the other sashes are allowed to remain in the open position. a

Fig. 24 is the final step in the o eration, wherein the operating mechanism of the lower sash has engaged the operating mechanism of the other sashes at the moment of returning all of said sashes from the open to the closed position.

In the construction of window frames of the type and kind which have a plurality of swinging sashes therein, it is necessary for ventilation purposes that said sashes be opened and closed at will. Where the height of said sashes above the floor level is beyond the reach of the arms of the person desiring to open or close said sashes, it becomes necessary to provide some mechanical means to assist the operator in manipulating the said sashes. Many window frames having a plurality of sashes therein are provided with mechanical operators for the sashes, whereby the said sashes may be opened and closed through manual operation of the sash operating mechanism. The present invention is one which embodies in the sash supporting mechanism an operating structure which is interconnected to all of the sashes, whereby all of the sashes may be opened or closed through manipulative movements applied to one of said sashes, and further, the one sash which functions as a handle for moving the remaining sashes, may be disconnected from the other. sashes at times, so that the operator sash may be opened or closed independently of the other sashes.

In detail the construction illustrated in the drawings comprises a substantially rectangular window frame, generally designated by the numeral I. The frame I, as shown in Fig. 6, is made of wood and represents a complete window frame bodily detached from an opening in a building. The inner contour of the frame I is constructed to receive a conventional type of wooden window sash therein. In the frame I, I have provided the respective sashes 3, 4 and 5, which are arranged in superposed relation in the frame I. Each of the sashes on opposite sides thereof has a plate 6 secured thereto, the upper end of said plate adjacent the head rail of the sash, having an end I thereof pivotally connected to a'slide member or shoe 8, slidably guided in the channel shaped guide 8. The channel shaped guide 9 may extend either continuously or interruptedly along the side of the window frame, there being one of said guides 9 at corresponding points on each of the opposite sides of the window frame. The guide 9 is interposed between the side of the window frame and the side rails of the respective sashes. Support arms III are pivoted at one end thereof to the sash plate 8, and at the opposite end said support arms are pivoted at II to the window frame, said support arms being arranged at corresponding points on opposite sides of the respective sashes and frame.

On each of the opposite sides of the frame and overlying the guides 8, I have arranged a control bar I2, said control bar being pivotally attached to the respective slide shoes 8 on each of the uppermost sashes 4 and 5. The lower end of each arm I2 is bent to form a shoulder I3 which will ride within the guide 8. On the inside of each bar I2 facing the guide 9, I have provided a plate I4 which has the upper end thereof bent The opposite end I8 of the plate I4 is spaced away from the shoulder I3 on the bar I2 9. distance slightly greater than the.

overall length of the slide shoe 8 on the lower sash 3.

When all of the sashes 3, 4, and 5 are arranged in the closed position in planar alignment in the window frame I, the same may be opened by pushing outwardly on the bottom rail of the lower sash 3. As the lower rail of said sash 3 is pushed outwardly, the slide shoes 8 on the head rail of said sash 3 commence to descend in the guide 9 and the position of the parts at this juncture is illustrated in Figs. 1 and 2. At the commencement of the opening movement of the lower sash, the lower end of the slide shoe 8 engages the shoulder I3 on the bar I2 and pulls said bar downwardly in direct proportion to the downward movement of the slide shoe 8 of said lower sash. The downward movement of the bars I2, through the pivotal connection thereof with the slide shoes 8 on the upper sashes 4 and 5, causes a corresponding downward movement of the same, thereby causing said upper sashes 4 and 5 to swing into the open position to the same degree as the lower sash 3. When the lower s'ash 3, and likewise the upper sashes 4 and 5, have been moved to the maximum open position, the shoulder I5 on the bar I2 registers with and rests upon a cam member "confined in the base of the guide 8, thereby deflecting each bar I2 laterally outward away from contact with the slide 8 on the lower sash, as shown in Figs. 3 and 4. In

this position the lower sash 3 may, if it be desired, be returned to the closed position as indicated in Fig. 6. However, in returning the lower sash 3 from the open position to the closed position, the slide 8 moves upwardly in the guide 3 until the upper end of the slide 8 contacts the shoulder I5 on the bar I2, and moves said shoulder off of the cam II, the bar I2 remaining in engaging opposite ends of the slide shoe 8 bethe laterally disposed position and the said upper sashes 4 and 5 remaining in the opened position. At this juncture the position of the lower sash 3 and of the slide shoe thereon, relative to the operating arms I2, is indicated in Fig. 5. In this position of the sashes, the lower 'sash may be opened or closed independently of the upper sashes 4 and 5, and without disturbing the open position thereof. In order to return the opened upper sashes 4 and 5 to the closed position, the lower sash 3 would be swung into the fully open position, thereby bringing the slide shoe of said sash to a point of registry between the shoulders I3 and IS on the control bars, at which time the inherent resiliency of the bar I2 would cause it to snap back into its normal position, thereby tween the shoulders I3 and It On said bar, as shown in Fig. '7. At this point in the operation, the lower rail of the lower sash 3 would be moved from the open position back into the closed position and simultaneously the upper sashes 4 and 5 would be brought from the opened to the closed position.

The action of disconnecting the lower sash 3 from the bar I2 which operates the upper sashes 4 and 5, is automatic, and is efiected simply by the manipulative movements of the said lower sash. The operator is not called upon to do anything other than move'the said lower sash through certain prescribed evolutionary movements and by so doing all of the sashes are fully opened or closed, or when all of the sashes are in open position, the lower sash may be entirely closed or maintained in any desired open position independently of and without changing the position of the upper sashes.

In the application of the invention tov metal windows, as shown in Figs. 9through 16 inclusive, I provide a metal window frame 2|! formed of structural bar members of desired shape, and within which a plurality of steel window sashes 2|, 22 and 23 are mounted, said respective sashes likewise being formed of structural bar-members of a shape which will complement and cooperate with the frame 20. Mullion bars 24 cross the frame between the meeting rails of the respective sashes 2|, 22 and 23. On each of the opposite sides of the frame 20 at corresponding points adjacent the upper sashes 22 and 23, I have provided an angular guide member 25, one flange of which extends toward the side edge of the sashes 22 and 23. A channel shaped guide member 32 is provided at corresponding points on opposite sides of the frame 20 adjacent the lower sash 2 A channel shaped slide shoe 26 is pivoted at 21 to the side of each sash adjacent the head rail thereof, and said sash slide shoes 26 are slidably confined on the respective guides 25 and 32.

A support arm 26 is pivotally connected at its upper end on the side of each sash, and at its other end pivotally connected at 3|] to the side of the frame '20, said support arms 28 being connected to the sash and frame at corresponding points on opposite sides thereof. The pivot 3|] on the support arms 28 of the uppermost sashes 22 and 23, is preferably mounted on a bracket 3| which projects beyond the inside face of the frame 20, while the pivot 30 on the support arm 28 of the lowermost sash 2| is pivoted to the side of the frame 2|] in line therewith.

Acontrol bar 40 is arranged on each of the opposite sides of the shoes 26 on the two uppermost sashes 22 and 23. The lower end of each control bar is provided with a resilient plate 33 thereon, the bottom end of said plate being shouldered inwardly at 34. The inner face of the plate 33 is provided with an abutment member thereon, the upper end of said abutment being shouldered at 36, and the lower end thereof shouldered at 31. The slide shoe 26 on the lower sash has a projecting shoulder 38 thereon, the length of which is slightly less than the distance between the shoulders 34 and 31 on the plate 33.

When all of the sashes 2|, 22 and 23 are arranged in closed position in planar alignment in the window frame 20, the same may be opened by pushing outwardly on the bottom rail of the lower sash 2|. As the lower rail of said sash 2| is pushed outwardly, the slide shoes 26 on the head rail of said sash 2| start to move downwardly on the guide 32 and the position of the parts of the apparatus at this point is clearly illustrated in Figs. 14 and 15. Each of the upper sashes at the commencement of the opening operation or at the finish of the closing operation, being substantially in the position indicated in Figs. 10 and 11. As the lower sash 2| starts to swing open, the lower end of the outstanding projection 39 of the shoulders 38 on the slide shoe 26 engages the shoulder 34 on the plate 33 and pulls the control bar downwardly in direct proportion to the downward movement of the slide shoe 26 on the guide 32. The downward movement of the bars 40 through the connection thereof with the shoes 26 on the upper sashes 22 and 23, causes a corresponding downward movement of the same, whereby said upper sashes 22 and 23 swing into the open position to the same degree as the lower sash 2|. When the lower sash 2|, likewise the upper sashes 22 and 23, have been moved to the maximum opened position, shown in Figs. 15 andlZ, the shoulder 36 on the plate bar 33 registers with and rests upon a cam surface 4| formed on the side of the guide-3 2, thereby deflecting each plate '33 and bar 43 laterally outward away from contact with the projecting shoulder 36 on the slide shoe-26 of the lower sash 2|, as shown in full lines in Fig. 15.

From this position the lower sash 2| may, if it be desired, be returned to the closed position. In returning the lower sash 2| from the opened to the closed position, the slide 26 on said lower sash moves upwardly on the guide 32 until the upper end of the said slide '26 contacts the inner shoulder 36 on the plate 33 and moves said shoulder off of the cam 4|, the bar 40 and plate 33 remaining in the laterally disposed position and the said upper sashes 22 and 23 remaining in the opened position. In this position of the sashes, the lower sash 2| may be opened or closed independently of the upper sashes 22 and 23, and without disturbing the open position thereof. In order to return the opened upper sashes 22 and 23 to the closed position, the lower sash 2| is swung into the fully opened position, thereby bringing the shoulder 38 on the sash slide shoe into a point of registery between the shoulders 34 and 31 on the bar plate 33, at which time the inherent resiliencyof the bar 40 and plate 33- would cause the same to return to its normal position, thereby engaging opposite ends of the slide shoe shoulder 38 between the shoulders 34 and 31 on the plate 33. At this point in the operation, the lower rail of the lower sash 2| would be returned from the opened back to the closed position, and simultaneously the upper sashes 2 2 and 23 would be brought from the opened to the closed position.

The action of connecting and disconnecting the lower sash 2| to and from the bar 40 which operates the upper sashes 22 and 23, is entirely automatic and is effected by predetermined positions of movement of the lower sash. The mode of operation of the structure shown in Figs. 9- through 16 inclusive, is substantially the same as that of the preferred form of the invention, wherein the manual movement of the lower sash causes simultaneous movement of the remaining sash during certain periods in the cycle of operation of the said lower sash, and at other'times said lower sash may be ope-rated independently of the upper sashes.

In the modified form of the invention shown in Figs. 17 through 24 inclusive, I have illustrated in Fig. '17 a rectangular window frame 50 formed of wood, the interior of which is adapted to receive the respective sashes 5|, 52 and 53. Each of the sashes 5|, 52 and 53 on opposite sides thereof, has a plate 54 secured thereto, the up per end of said plate adjacent the head rail of the sash having an end thereof pivotally connected to a slide member or shoe 56, slidably guided in a guide 51. The guide 51 may extend either continuously or interruptedly along the side of the frame 50, there being one line of said guides at corresponding points on each of the opposite sides of the window frame. Support arms 58 are pivoted at one end thereof to the sash plate 54, and at the opposite end said support arms are pivoted at 59 to the window frame, said support arms being arranged at corresponding points on opposite sides of the respective sashes and frame. 4

On each of the opposite sides of the frame and overlying the guides 51, I have arranged a control bar 60, said control bar being pivotally attached to the respective slide shoes 56 on each of the uppermost sashes 52 and 53. Adjacent the lower end of each control bar 60, I have proyidd the respective shoulders 6| and 62, said shoulders being spaced apart and being arranged on opposite sides of the slide shoe 56 of the lower sash The lower end of the bar 60 is curbed at 63 to contact a cam 64 having a pair of raised surfaces 65 and 66 thereon, as will be hereinafter described.

When all of the sashes 5|, 52 and 53 are arranged in the closed position in planar alignment in the frame 50, the same may be opened by pushing outwardly on the bottom rail of the lower sash 5|. As the lower rail of said sash is gages the shoulder 6| on the bar 60 (see Fig. 22), 'and pulls said bar downwardly in direct pro-A portion to the downward movement of the slide shoes 56 of said lower sash. The downward movement of the bar through the connection thereof with the slide shoes 56 on the upper sashes 52 and 53, causes a corresponding downward movement of the same, thereby causing said upper sashes 52 and 53 to swing into the opened position to the same degree as the lower sash 5|. When the lower sash 5|, and likewise the upper sashes, have been moved to the maximum open position, the curved end 63 of the control bar 60 rests upon the surface 66 of the cam 64 and deflects the bar 60 laterally outward away from contact with the slide shoe 56 on the lower sash, as shown in Fig. 23. In this position the lower sash 5|, may, if it be desired, be returned to the closed position indicated in Fig. 23.- However, in returning the lower sash 5| from the opened position to the closed position, the slide 56 moves upwardly on the guide 51 until the upper end of the' slide 56 contacts the shoulder 62 on the bar 6|) and moves the curved end 63 of said bar 60 off of the cam face 66 down onto the cam face 65, the bar 60 otherwise remaining in the laterally disposed position, and the upper sashes 52 and 53 remaining in the opened position. At this point, the position of the lower sash 5| and of the slide shoe 56 thereon relative to the operating arms 60, is indicated in Fig. 23. In this position of the sashes, the lowersash may be opened or closed independently of the upper sashes and without disturbing the open position thereof. In order to return the opened upper sashes 52 and 53 to the closed position, the lower sash 5| would be swung into the opened position, thereby bringing the slide shoe 56 of said lower sash to a point of registry between the shoulder 6| and the shoulder 61 on\the control bars 60, at which time the inherent resiliency of the bars 60 would cause the same to snap back into the normal position, thereby engaging opposite ends sashes are controlled entirely by the manipulative movements applied to .the lowermost sash. The -cam members on the frame which engage the control bars automatically connect and disconnect said bars with the lowermost sash at certain predetermined positions of movement of said lowermost sash, and the return of the sashes is not required to operate any operating mechanism to open or close the sashes.

Having thus described this invention, what I claim and desire to secure by Letters Patent is:

1. A multiple window sash construction comprising, a window frame; a plurality of sashes in said frame; guides at corresponding points on opposite sides of aid frame; a raised cam in each of said guidesy lides in said guides pivotally secured at corresponding points on opposite sides of an end of each of said sashes; carrier arms pivotally connected to each of said sashes and to the frame at corresponding points on opposite sides thereof; bars slidably guided on each of the opposite sides of said frame and connected to the slides of all sashes but one, the slides on said one sash being detachably connected to said bars, whereby'the opening and closing movements of all said sashes are controlled by said one sash; and means on each of said bars cooperating with the slides of said one sash and said raised cams to disconnect said bars from said slides when all of said sashes are fully opened whereby said one sash may be operated independently of said other sashes.

2. A multiple window sash construction comprising, a window frame; a plurality of sashes in said frame; guides at corresponding points on opposite sides of said frame; a raised cam in each of said guides; slides in said guides pivotally secured at corresponding points on opposite sides of an end of each of said sashes; carrier arms pivotally connected to each of said sashes and to the frame at corresponding points on opposite sides thereof; bars slidably guided on each of the .opposite sides of said frame and connected to .the slides of all sashes but one, the slides on said one sash being detachably connected to said bars, whereby the opening and closing movements of all said sashes are controlled by said one sash; means on each of said bars cooperating with the slides of said one sash; and means on each of said bars cooperating with each of the raised cams when all of said sashes are fully opened to disconnect the bars from the slides on said one sash, whereby said one sash may be operated independently of said other sashes.

3. A multiple window sash construction comprising, a window frame; a plurality of sashes in said frame; guides at corresponding points on opposite sides of said frame; a raised cam in each of dow structure last described, the plurality of said guides; slides in said guides pivotally secured to corresponding points on. opposite sides of an end of each of said sashes; carrier arms pivotally connected to each of said sashes and to the frame at corresponding points on opposite sides thereof; bars slidably guided on eachof the opposite sides of said frame and connected to the slides of all sashes but one, the slides on said one sash being detachably connected to said bars, whereby the opening and closing movements of all said sashes are controlled by said one sash; means on each of said bars cooperating'with the slides on said one sash; and means on each of said bars to engage each of the fixed cams when all of said sashes are fully opened to deflect each of said bars and thereby disconnect the bars from the slides on said one sash whereby said one sash may be operated independently of said other sashes. 4. A multiple window sash construction comprising, a window frame; a plurality of sashes slidably pivoted in said frame; bars slidably mounted on opposite sides of said frame and operatively connected to each of said sashes to operate all' of said sashes simultaneously; a I raised cam on each of the opposite sides of said frame; and a projection on each of said bars to engage a correlated cam when all of said sashes are fully opened to disconnect said slide bars from one of said sashes, whereby the disconnected opened to deflect each of said bars to disconnect said slide bars from one of said sashes, whereby the disconnected sash may be moved independently of the other sashes.

6. A multiple. window sash construction comprising, a window frame; a plurality of sashes slidably pivoted in said frame; bars slidably mounted on opposite sides of said frame and operatively connected to-each of said sashes to operate all of said sashes simultaneously; means on said frame engaging said slide bars to automatically disconnect said slide bars with one of said sashes at certain positions of movement on said one sash, said means comprising a raised cam on each of the opposite sides of the window frame; and a shoulder on each of said bars to engage a correlated cam when all of said sashes have been simultaneously moved to the fully opened position to disconnect said bars from said one sash to allow operation of said disconnected sash independently of the others.

7. Ina window comprising a plurality of sashes controlled by operation of one sash, means for releasing the control sash for movement independently of the other sashes, and means whereby the initial opening movement of the control sash causes opening of the other sashes and operates said releasing means to permit independent closing of the control sash.

8. In a window comprising a plurality of sashes controlled by operation of one sash, means operable automatically upon opening movement of the control sash for releasing the control sash to permit it to be closed while the other sashes are open, and means operable upon opening of the control sash as far or farther than the other sashes to reestablish its controlling relation.

9. In a window having separately swinging sash, means-releasably connecting said sash for simultaneous operation, and means effective upon initial opening movement of one sash to condition the connecting means to permit independent closing of said sash and to condition said means to cause simultaneous opening of all the sash.

10. In a window having separately swinging sash, means releasably connecting said sash for simultaneous operation, and means effective upon initial opening movement of one sash to condition the connecting means to permit independent closing of said sash and to condition said means to cause simultaneous opening of all the sash, said means being effective upon subsequent movement of the one sash in a closing direction to condition the connecting means to again connect the sash for simultaneous operation when the one sash is again opened to or beyond the angle of the other sash.

11. In a window comprising a plurality of sashes controlled by operation of one sash, means operable automatically upon opening movement 1 of the control sash for releasing the control sash to permit it to be closed while the other sashes are open, said means also being operable upon opening of the control sash as far or farther than the other sashes to reestablish its controlling relation. g

12. In a multiple sash window, a frame, at least two sashes carried by the'frame for swinging movement, means serving to interconnect said sashes for conjoint swinging movement upon manually swinging one of them, said last means including vertically moving travel bars disposed in the sides of the frame, a clutch mechanism interposed in said interconnecting means whereby when said clutch mechanism is disengaged said one sash can be swung independently of the other, and means including a pair of cam elements for elfecting automatic disengagement and engagement of said clutch mechanism as the sashes are manipulated, one of said cam elements being carried by a travel bar and the other of said cam elements being carried by the frame.

13. In a multiple sash window, a frame, at least two sashes carried by the frame for swinging movement, means serving to interconnect said sashes for conjoint swinging movement upon manually swinging of one of them, said means including two pairs of members slidably mounted in the sides of the frame, clutch mechanisms intercam element of each pair being carried by the frame.

14. A multiple window sash construction comprising a window frame; a plurality of sashes slidably pivoted in said frame; bars slidably .mounted on opposite sides of said frame and operatively connected to each of said sashes to operate all of said sashes simultaneously; means on said frame engaging said slide bars to automatically operate the same when all of-said sashes. are fully opened and thereby-disconnect said slide bars from one of said sashes, whereby the disconnected sash may be moved independently of the other sashes.

ALBERT G. LARSON. 

